Feature #3670: add visibility into agent LWP's spymaster - illumos gate - illumos

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Feature #3670

closed

add visibility into agent LWP's spymaster

Added by Robert Mustacchi over 9 years ago. Updated over 9 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Bryan Cantrill

Category:

kernel

Start date:

2013-04-02

Due date:

% Done:

100%

Estimated time:

Difficulty:

Medium

Tags:

Gerrit CR:

Description

From the Joyent bug report:

Based on HVM-771 and the other dumps that we have located with the agent LWP having induced a seg fault, presumably because it went rogue (see OS-2084). We need in situ and postmortem observability into the agent LWP's spymaster.

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Updated by Bryan Cantrill over 9 years ago

Here's the output from pflags of a core that died with the agent LWP:

# pflags core
core 'core' of 28244:   bash
        data model = _ILP32  flags = RLC|MSACCT|MSFORK
 /1:    flags = STOPPED  read(0x0,0x80472af,0x1)
        why = PR_SUSPENDED
 /2:    flags = DETACH|AGENT
        sigmask = 0xfffffeff,0xffffffff,0x000000ff
        cursig = SIGSEGV
        spymaster = pid 28261, "./pbad64 28244" at 2013-04-01:13.50.30

And here's an elfdump of the same core:

# elfdump -n core
[ ... ]
  entry [19]
    namesz: 0x5
    descsz: 0x150
    type:   [ NT_SPYMASTER ]
    name:
        CORE\\0
    desc: (psinfo_t)
        pr_flag:         [ SMSACCT ]
        pr_nlwp:         1
        pr_pid:          28261               pr_ppid:     28250
        pr_pgid:         28261               pr_sid:      28250
        pr_uid:          0                   pr_euid:     0
        pr_gid:          0                   pr_egid:     0
        pr_addr:         0x00000000          pr_size:     0
        pr_rssize:       0                   pr_ttydev:   6
        pr_pctcpu:       0.0%                pr_pctmem:   0.1%
        pr_start:
            tv_sec:      1364824230          tv_nsec:     486597268
        pr_time:
            tv_sec:      1364824230          tv_nsec:     489772091
        pr_ctime:
            tv_sec:      0                   tv_nsec:     0
        pr_fname:        pbad64
        pr_psargs:       ./pbad64 28244
        pr_wstat:        0                   pr_argc:     2
        pr_argv:         0x00000000          pr_envp:     0x00000000
        pr_dmodel:       [ PR_MODEL_LP64 ]
        pr_taskid:       1152                pr_projid:   1
        pr_nzomb:        0                   pr_poolid:   0
        pr_zoneid:       0                   pr_contract: 1343
        pr_lwp:
            pr_flag:     0
            pr_lwpid:    1                   pr_addr:     0x00000000
            pr_wchan:    0
            pr_stype:    [ SOBJ_NONE ]
            pr_state:    6                   pr_sname:    O
            pr_nice:     20
            pr_syscall:  [ write ]
            pr_oldpri:   40                  pr_cpu:      0
            pr_pri:      59                  pr_pctcpu:   0.0%
            pr_start:
                tv_sec:  1364824230          tv_nsec:     0
            pr_time:
                tv_sec:  0                   tv_nsec:     0
            pr_clname:   FSS
            pr_name:     
            pr_onpro:    0                   pr_bindpro:  -1
            pr_bindpset: [ PS_NONE ]
            pr_lgrp:     0

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